Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b6d887752e6548…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 18:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7f763dd09a3367a5d8bc946f2a1c3c73 SHA-1: 9187d53eb4615433e3b866bdb6798e492bc9c84c SHA-256: 12b6d887752e6548ae300a0c219f145bc053c409ea8a70fe8838d31f9a8d33c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads, suggesting it's designed to host or link to malicious content. The presence of link farm heuristics further supports the attack pattern of directing users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gbnoijvmsca71r685s5t2gl72/38178515044.pdf In PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/45359853222.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/gufezemexojemo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/verona.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/51280678950.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be048379cb8---zokotuwusofa.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/03895be69e96f5a3e7a247afe674572a/72361343904.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vonovejafevisij.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e26206d2c---nisasadevugoxefawebe.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/7544317229.pdfIn PDF document text
    • http://www.centralperdana.com/file/64589620458.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8e05d17317498cd7f924cfd81455ab79/74047149253.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/87247360755.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/saroxibip.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/119d8f4bf0ecfbecd8ba771439cb6711/moxarafasupidem.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/59409564773.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tutixike.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kurifavute.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/89d1b36553c06971ab5a1c0e7ed01bca/51380605976.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/kapojedujesonazipuxe.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/likikatekodojivofo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504201221716.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba0013d10---90083507905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=15+electrical+circuits+worksheet+b+parallel+circuit+problems+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 17728 bytes
SHA-256: 293bf3dc07abeed4c96d696ef3b22fc498ced748aa26aa9bbeac27765ab52f7f
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 11144 bytes
SHA-256: eba15d3c5c231e92f14cc0cb6e096482837c6a0342c56952227565b1b60b8a58
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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